Question # 1

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

The anodes in cathode ray oscilloscope.

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Control number of waves

Control brightness of sept formed

Accelerate as well as focus beam

Negative potential w.r.t to chithode

Electric potential at a distance ''r'' from ''q'' is:

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V_r = 1/54πε_∘q/r₂

Vr=1/4πε_∘²q/r

V_r=1/4πε_∘2q/r

V_r=1/4πε_∘q²/r

Which of the following are not hadrons.

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Muons

Mesons

Positrons

Neutrons

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

The semi conductor diode has the property of

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Two way conduction

Zero conduction

One way conduction

Amplification

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

Photo copier and inkjet printer are the applications of

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Magnetism

Electricity

`.Electro magnetism

Electrostatics

The electrostatic force between two charges is 42 N, If we place a dielectric of E_y=2.1 between the charges then the force become equal to.

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42 N

88.2 N

20 N

2 N

The material whose resistivity becomes zero below a certain temperature

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Conductors

Semi conductors

Super conductors

Insulators

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

The activity of radioactive sample

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Is constant

Increases with time

Decreases linearly with time

Decreases exponentially with time

The ratio of applies stress to volumetric strain is called:

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Young modulus

Shear modulus

Bulk modulus

Tensile modulus

The P.D develop in case of silicon is:

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0.7V

0.3V

0.5V

0.9V

The AC system is preferred to DC system because:

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AC voltage can be easily changed in magnitude

DC motor angular velocity is affected badly

High voltage AC transmission is less efficient

Domestic appliance require AC voltage for their operation

X- ray diffraction reveals that these are

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Particle type

Wave type

Both wave and particle

None of above

Which one of the following is polymeric solids

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Glass

Nylon

Copper

Zinc

Conversion of A.C into D.C is called:

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Compton effect

Rectification

Amplification

Pair production

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